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Boxelder Bug PM 5/11/04 BOXELDER BUG Integrated Pest Management around the Home and Landscape The western boxelder bug (Boisea rubrolineata) is often a nuisance pest around and in homes. Boxelder bugs usually feed on the leaves, flowers, and seedpods of the female or seedbearing box elder tree (Acer negundo). They may also subsist on male box elder trees and occasionally occur on maple and ash trees. They may feed on the fruits of almond, apple, cherry, peach, pear, and plum trees, and on grapes, where their feeding punctures cause the fruit to (actual become deformed. Large numbers of size) the bug usually occur only on female box elder trees. Figure 1. Boxelder bug adult. Figure 2. Boxelder bug nymph. IDENTIFICATION When full grown, this bug is about 1⁄2 LIFE CYCLE pear on light painted surfaces outdoors inch long and one-third as wide (Fig. 1). In spring the overwintered female bugs on the south and west sides of the Adults are mostly black and have three lay eggs in the cracks and crevices of the house, resting in the sun. red lines on the pronotum of the thorax box elder tree’s bark, and the nymphs and several fine red lines on each wing. hatch in a few days. The nymphs grow DAMAGE The wings lie flat on the bug’s back larger and develop into adults during The bugs do little damage to ornamen- when it is at rest. The abdomen is red. the summer. They then mate and lay tal trees. They may occasionally cause The young nymphs (Fig. 2) are bright eggs that hatch into the nymphs of a puckering or distortion of fruit in com- red and when about half-grown become second generation. Adults and nymphs mercial orchards, but this is rarely a marked with black and begin to de- periodically migrate in large groups, significant problem. They do not injure velop black wing pads. Eggs are yellow often covering tree trunks, the ground, people or pets, but when they come when first laid, but become red as fences, and the sides of houses. indoors they can be annoying and may nymphs develop inside. spot curtains, furnishings, and clothing Most of the nymphs of the second gen- with their excrement. When crushed, Boxelder bugs are true bugs (Order: eration grow to full size in August and they give off an offensive odor. They do Hemiptera) in the family Rhopalidae. September. In fall the adults seek over- not breed indoors. If trapped in base- They are sometimes confused with wintering places in dry, sheltered hol- ments or houses, they will eventually other true bugs including the bordered low tree trunks; under rocks, boards die. plant bug (Largus cinctus, family and other debris; in cracks and crevices Largidae), small milkweed bug (Lygaeus in walls; in door and window casings; MANAGEMENT kalmii, family Lygaeidae), and squash around building foundations; and in- Boxelder bugs do not cause significant bugs (Anasa spp., family Coreidae). The side houses. They become a nuisance damage to landscape plants, and man- three lengthwise red lines on the outdoors in patios or indoors when they agement need only be directed at keep- pronotum (one down the middle and invade in significant numbers. On ing them out of homes, where they may on each margin) distinguish boxelder warm days during winter and early become a nuisance. If boxelder bugs bugs from these other species. spring, boxelder bugs sometimes ap- frequently invade homes, seal up entry PEST NOTES Publication 74114 University of California Agriculture and Natural Resources May 2004 May 2004 Boxelder Bug removing the trees, especially the sides of the house. Keep box elder tree female or pod-bearing trees (Fig. 3), is seeds swept up. A weed and debris- the most effective way of controlling free strip tends to reduce the congre- the pest. Be careful not to plant or allow gation of bugs near the foundation. the establishment of new box elder trees in your yard. Wash boxelder bugs off of walls or tree trunks with a forceful stream of However, elimination of trees on your water. Boxelder bugs are susceptible property won’t always completely re- to drowning. solve the problem. Full-grown, winged adults can fly for distances of several Chemical Control blocks, so boxelder bugs may also mi- Insecticide sprays are generally not grate in from a neighbor’s tree. recommended for boxelder bug man- agement. They are often no more ef- If removal of trees is not an option, fective than vacuuming and hosing, clear fallen seeds from beneath and and repeated applications may be near trees. Use a broom or shop required. Insecticidal soap applied in a vacuum on hard surfaces such as patios forceful spray of water may reduce and driveways. A shop vacuum will populations on tree trunks. Pyrethroid also remove most seeds from grassy insecticides are available for treating areas. foundation walls around the perim- eter of buildings. If required, these Exclusion and Sanitation applications are best done by a profes- Repair torn screens and close up places sional. Special care must be taken to where the bugs can enter the house, avoid runoff of pesticides from walls such as cracks around doors and win- and foundations into storm drains, seedpod dows and attic or basement vents. Use because they lead directly into creeks caulk, weatherstripping, fine-mesh and rivers. Do not use sprays for screen, steel wool, or expandable foam boxelder bugs inside the house. Figure 3. Leaves and seedpods of female as appropriate. Boxelder bugs that enter box elder tree. the home may be controlled by hand- REFERENCES collecting or vacuuming. A shop Davis, C. S., and J. J. Joos. 1975. Box points into the home and consider re- vacuum is an excellent tool for this Elder Bug. Oakland: Univ. Calif. Div. moving female box elder trees. Sanita- purpose. Repeat as needed. Agric. Nat. Res. Leaflet 2790. (out of tion practices such as vacuuming can be print) used to reduce population numbers, Eliminate hiding places such as piles but vigilance may be required during of rocks, boards, leaves, and general Dreistadt, S. H. 2004. Pests of Landscape fall migration. Insecticide use is rarely debris close to houses. Boxelder bugs Trees and Shrubs. 2nd ed. Oakland: Univ. justified. hide during the day or overwinter in Calif Agric. Nat. Res. Pub 3359. these sites. Rake leaves and remove Elimination of Host Trees weeds and grass from a 6- to 10-feet Ebeling, W. 1975. Urban Entomology. Since the box elder tree is the main wide strip around the foundation, Oakland: Univ. Calif. Div. Agric. Nat. source of food for the boxelder bug, particularly on the south and west Res. ◆ 2 ◆ May 2004 Boxelder Bug For more information contact the University of California Cooperative Extension or agri- cultural commissioner’s office in your coun- ty. See your phone book for addresses and phone numbers. AUTHOR: E. J. Perry TECHNICAL EDITOR: M. L. Flint CCORDINATION, DESIGN, AND PRODUCTION: M. Brush ILLUSTRATIONS: Figs. 1 & 3: Christine M. Dewees. Fig. 2: Insects. The Yearbook of Agriculture 1952. USDA. Washington, D.C.: U.S. Gov. Printing Office. Produced by IPM Education and Publica- tions, UC Statewide IPM Program, Universi- WARNING ON THE USE OF CHEMICALS ty of California, Davis, CA 95616-8620 Pesticides are poisonous. Always read and carefully follow all precautions and safety recommendations given on the container label. Store all chemicals in the original labeled containers in a locked cabinet or shed, This Pest Note is available on the World away from food or feeds, and out of the reach of children, unauthorized persons, pets, and livestock. Wide Web (http://www.ipm.ucdavis.edu) Confine chemicals to the property being treated. Avoid drift onto neighboring properties, especially gardens containing fruits or vegetables ready to be picked. Do not place containers containing pesticide in the trash nor pour pesticides down sink or toilet. Either use the pesticide according to the label or take unwanted pesticides to a Household Hazardous Waste Collection site. Contact your county agricultural commissioner for additional information on safe container disposal and for the location of the Household Hazardous Waste Collection site nearest you. Dispose of empty containers by following label directions. Never reuse or burn the containers or dispose of them in such This publication has been anonymously peer re- a manner that they may contaminate water supplies or natural waterways. viewed for technical accuracy by University of Cal- ifornia scientists and other qualified professionals. The University of California prohibits discrimination or harassment of any person on the basis of race, This review process was managed by the ANR color, national origin, religion, sex, gender identity, pregnancy (including childbirth, and medical condi- Associate Editor for Pest Management. tions related to pregnancy or childbirth), physical or mental disability, medical condition (cancer-related To simplify information, trade names of products or genetic characteristics), ancestry, marital status, age, sexual orientation, citizenship, or status as a have been used. No endorsement of named products covered veteran (covered veterans are special disabled veterans, recently separated veterans, Vietnam is intended, nor is criticism implied of similar products era veterans, or any other veterans who served on active duty during a war or in a campaign or expedi- that are not mentioned. tion for which a campaign badge has been authorized) in any of its programs or activities. University This material is partially based upon work policy is intended to be consistent with the provisions of applicable State and Federal laws. Inquiries supported by the Extension Service, U.S. Department regarding the University’s nondiscrimination policies may be directed to the Affirmative Action/Staff of Agriculture, under special project Section 3(d), Personnel Services Director, University of California, Agriculture and Natural Resources, 300 Lakeside Integrated Pest Management.
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